#include <stdio.h>
#include <unistd.h>

int gval = 100;

int main()
{
    pid_t id = fork();
    if(id == 0)
    {
        while(1)
        {
            printf("子: gval: %d, &gval: %p, pid: %d, ppid: %d\n",gval,&gval,getpid(),getppid());
            sleep(1);
            gval++;
        }
    }
    else
    {
        while(1)
        {
            printf("父: gval: %d, &gval: %p, pid: %d, ppid: %d\n",gval,&gval,getpid(),getppid());
            sleep(1);
        }
    }

}



//#include <stdio.h>
//#include <unistd.h>
//#include <stdlib.h>
//
//int g_unval;
//int g_val = 100;
//
//int main(int argc, char *argv[], char *env[])
//{
//    const char *str = "helloworld";
//    printf("code addr: %p\n", main);
//    printf("init global addr: %p\n", &g_val);
//    printf("uninit global addr: %p\n", &g_unval);
//    
//    static int test = 10;
//    char *heap_mem = (char*)malloc(10);
//    char *heap_mem1 = (char*)malloc(10);
//    char *heap_mem2 = (char*)malloc(10);
//    char *heap_mem3 = (char*)malloc(10);
//    printf("heap addr: %p\n", heap_mem); //heap_mem(0), &heap_mem(1)
//    printf("heap addr: %p\n", heap_mem1); //heap_mem(0), &heap_mem(1)
//    printf("heap addr: %p\n", heap_mem2); //heap_mem(0), &heap_mem(1)
//    printf("heap addr: %p\n", heap_mem3); //heap_mem(0), &heap_mem(1)
//    
//    printf("test static addr: %p\n", &test); //heap_mem(0), &heap_mem(1)
//    printf("stack addr: %p\n", &heap_mem); //heap_mem(0), &heap_mem(1)
//    printf("stack addr: %p\n", &heap_mem1); //heap_mem(0), &heap_mem(1)
//    printf("stack addr: %p\n", &heap_mem2); //heap_mem(0), &heap_mem(1)
//    printf("stack addr: %p\n", &heap_mem3); //heap_mem(0), &heap_mem(1)
//    
//    printf("read only string addr: %p\n", str);
//    for(int i = 0 ;i < argc; i++)
//    {
//     printf("argv[%d]: %p\n", i, argv[i]);
//    }
//    for(int i = 0; env[i]; i++)
//    {
//        printf("env[%d]: %p\n", i, env[i]);
//    }
//
//    return 0;
//}
